She is the older sister and legal guardian of Makoto Niijima since their father's death a few years prior. During the course of the story, she would work as a public prosecutor of the Tokyo District Special Investigation Department at the Public Prosecutors Office. Sae is a tall and beautiful woman with upper-back length, ashen-brown hair that is asymmetrically parted on her right side and brown eyes. Sae is intelligent, professional and serious, and a workaholic.